Duncan Mwrote a review of Smartwool Smartloft 120 Jacket - Men's on March 1, 2019
Familiarity: I've used it several times
Fit: True to size
This jacket is great for aerobic activities since the insulation is only on the front. I was really impressed with how this jacket performed under my ski shell, I normally overheat easily when skiing but in ~17-8°F weather I was very happy with the warmth provided and also the breathability of the jacket. I didn't have any sweat built up on the back of the chest panel, which was a concern. Also a very comfortable piece to wear to the pub once you get off the mountain, and folds up smaller than expected in your pack.
The jacket is sized to fit over a base layer and 100/200wt fleece but not much more than that. Definitely a midlayer fit, sleeves are a touch long but I don't mind, they are nice and stretchy with comfortable thumb holes.